Stop-cock.



G. T. STARK.

sToP 000K.

APPLICATION FILED 3111.6-, 1909. 953,067. Patented Mar.f29, 1910.

VVENTOH 'd' TTHNEY GEORGE T. STARK, OF LOUISVILLE, KENTUCKY.

STOP-COCK.

Application filed January 6, 1909.

Specification of Letters Patent.

Patented Mar. 29, 1910.

Serial No. 471,011.

To all whom it 'may concern:

Be it known that I, GEORGE T. STARK, a citizen oi' the United States,residing at Louisville, in the county of Jefferson and State ofKentucky, have invented a new and useful Stop-Cock, of which thefollowing is a specification.

This invention relates to stop-cocks, and the objects of my improvementare, to provide means in a stop-cock for automatic adjustment to take upwear, to provide that the plug may be easily turned and not becomelocked, effectiveness, and durability.

The stop-cock or plug-cock is generally recognized as a very desirableand efficient valve. On account of the elongated ports, it is notsubject to erosion of its exposed surfaces on account of wiredrawing andthe action of liquids in rapid motion. Vhen this class of valve isclosed, a blank wall is presented to the fluid under pressure and whenthe valve is open, the elfective surface is protected in the seat of thebody. This is not the case with the globe-valve, in which delicateinternal parts, such as the stem, with its screw, and the valve member,as well as the seat, which must generally rbe accurately ground, areexposed to the running fluid while passing through the valve. Diiiicultyhas, however, been experienced with the conventional plug-cock inadjusting the plug and from the plug becoming locked. As the plugbecomes worn slightly it begins to leak and therefore must be tightenedup. In tightening it is difficult to screw up the nut just sufficientlyto tighten it without locking the plug so that it cannot be turned inoperation. The effective surface which is exposed to the fluid stoppedoli", also, becomes somewhat corroded, so that the plug will not startwithout great diliiculty. Under these circumstances it has been foundnecessary to unscrew the nut and drive the plug upward with a hammer orother suitable tool and then read'ust the plug. I have overcome thesediiticu ties by providing a generously long spring to hold the plug downto its work yieldingly, and yet have preserved the proper compactnessand symmetry. These objects I attain by means of the device illustratedin the accompanying drawings, in which- Figure 1 is a verticallongitudinal sectional view; Fig. 2, an end elevation; Fig.

3, a top plan view with the bonnet removed; Fig. 4, a detail perspectiveview of the plug; Fig. 5, a horizontal section on line A--B of F 4L;and, Fig. 6, is a perspective view of the socket extension of the plug.

Similaireference numerals ret'er to similar parts throughout the severalviews of the drawings.

The body, 1, is of the usual construction, and provided with the usualtaper hole, 2., in which a plug, 3, is seated. The small end of thetaper hole 2 in the body, however, is not open as usual, but preferablyclosed by a bottom-wall, 1, and the lower end of the taper hole ispreferably expanded as at 5, just above the bottom-wall 4. Thebottomwall 4L is provided with a hole, (i, adapted to receive a stem, 7.The hole 6 is provided with a keyway adapted to receive a key, 8, instem 7, to prevent the stem from turning. The body 1 is shown internallythreaded at the top to receive a correspondingly threaded bonnet, 9.

The plug 3 is provided with the usual ports, 10, on each side, to permitthe fluid to pass through when the ports register with the fluid-passagein the valve body. The pluoP is, however, not formed solid, as usual,with the port 10 passing dametrically through the plug, but is formedwith an annular passage, 1l., between the outer tavpered wall, 12, ot'the plug, and a cylindrical wall, 13, which is concentric with the wall12. Within wall 13 is provided a well, 14, adapted to receive stem 7 anda spring, 15. The bottom of the well 14 is provided with a hole adaptedto receive stem 7 snugly, and with a shoulder, 16, adapted to receive acollar, 17 on stem 7, and also to form an abutment for the lower end ofspring 15. It will be observed that, when the valve is open, fluid maypass through ports 10 and annular passage 11 on each side of wall 13(Fig. 6).

The upper end of pluo 3 is provided with a hexagon top, 18, ac apted toreceive a socket-wrench extension, 19, which in turn is provided with ahexagon socket corresponding to the top 1S of the plug. Thesocket-wrench extension 19 is preferably provided with a square top, 20,adapted to receive a Wrench or key for operating the The stem 7 isthreaded on its lower end and thus adapted to receive adjustin nut's, 21and 22, and is provided with a at, so as to adapt it to receive a Dwasher, 23, not shown in detail in the drawing because well known in theart. The upper end of stem 7 is provided with a nut, 24, and a locknut,25, for adjusting the pressure of spring 15 which abuts against nut 24underneath.

In assembling the cock, plug 3 is inserted in the taper seat in body 1,stem 7, with spring 15 placed thereon, is inserted through the hole inthe bottom .of well 14 and through the opening 6 in the bottom ofbody 1. The adjusting nuts 21 and 22 are screwed up to such a positionthat collar 17 comes a little short of bearing upon shoulder 16, andplug 3 has therefore a little vertical play. Nuts 24 and 25 areadjusted, so that spring 15 bears with the requisite pressure upon thebottom of plug 3 to keep the plug seated, notwithstanding the upwardpressure of the liuid against the upper wall of passage 11 when thevalve is open in case there should be back pressure. The plug 3 will nowbe held down in its seat yieldingly, so that if it should have atendency to stick in the seat, it will readily yield to the forceapplied to turn it. The spring 15 is always ready to press the plug downinto its seat and take up any wear that may occur. It will be observedthat the well 14 provides a long opening for a generous compressionspring 15, which provides for uniform pressure upon the plug. It isobvious also that the spring 15 and stem 7 with its threads and othercomparative delicate parts are protected from the fluid by the wall 13around which the fluids pass while passing through the valve.

Having now described my invention sol that any one skilled in the artpertaining thereto may make it and understand its use, I claim- 1. Astop-cock, comprising a body provided with a fluid-channel, a transverseta-Y pered plug-opening, a tapered valve-plug extending through saidtransverse opening, said valve-plug being provided with an axialcylindrical portion and an annular passage between said cylindricalportion and its tapered wall which is closed at its ends and providedwith antipodal openings adapted to permit the passage of fluid throughsaid plug on both sides of said cylindrical portion.

2. A stop-cock, comprising a body portion, a tapered plug in said bodyportion, said plug being provided with an axial aperture, a postextending through said aperture, a long helical spring surrounding saidpost adapted to yieldingly press said plug into its socket, and means onsaid post for adjusting the compression of said spring.

3. A stop-cock, comprising a body, a tapered plug, said tapered plugprovided with a central well, wrench faces on its upper end, asocket-wrench extension, and a concentric l'luid passage between thewall of said central well and the tapered wall of the plug,

`a post in the center of said well, adjusting means on the upper end ofsaid post, a spring surrounding said post adapted to press against saidadjusting means and hold said plug down yieldingly in its seat, and saidbody provided with a bonnet adapted to partly cover and hold in placesaid socket wrench extension.

GEORGE T. STARK.

Vitnesses THOMAS RUSH, ABRAHAM KNoBEL.

